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JavaScript JavaScript Basics (Retired) Creating Reusable Code with Functions Passing an Argument to a Function

Prakhar Patwa
Prakhar Patwa
11,260 Points
Posted by Prakhar Patwa
Prakhar Patwa
11,260 Points

i have a question regarding function

my js code is 

function getArea(length , width)
{ 
    var area = length * width ;
    return "<h1>Area of <a href='#' style = 'color:red; text-decoration:none;' >Rectangle</a> is " + area + "</h1>";
}

document.write( getArea(34 , 22) );

============================================= how to take a user input in this? prompt("what is the length?"); prompt("what is the width?");

script.js 
function returnValue(a){
  return a ;
}

var echo = returnValue('My argument');
index.html 
<!DOCTYPE HTML>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>JavaScript Basics</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>

2 Answers

Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

You could either assign the return value of the prompt function calls to two variables as Vitor Freitas recommended, or you could just call the getArea function, passing in the prompt function calls as parameters:

function myFunc(x, y) {
  // function code here...
}

var x = prompt("What is x?");
var y = prompt("What is y?");

myFunc(x, y);

OR

function myFunc(x, y) {
  // function code here...
}

myFunc(prompt("What is x?"), prompt("What is y?"));

Obviously the first is a bit easier to read and understand.

Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

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Vitor Freitas
Vitor Freitas
3,579 Points
Vitor Freitas
Vitor Freitas
3,579 Points

You can do it this way :

var length= prompt("what is the length?"),
    width = prompt("what is the width?");
Prakhar Patwa
Prakhar Patwa
11,260 Points
Prakhar Patwa
Prakhar Patwa
11,260 Points

will it be in the function or in the argument?